package org.example.easybuy.util;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import java.util.Vector;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;

public class SftpUtil {
	private transient Logger log = LoggerFactory.getLogger(this.getClass());  
    
    private ChannelSftp sftp;  
        
    private Session session;  
    /** SFTP 登录用户名*/    
    private String username;  
    /** SFTP 登录密码*/    
    private String password;  
    /** 私钥 */    
    private String privateKey;  
    /** SFTP 服务器地址IP地址*/    
    private String host;  
    /** SFTP 端口*/  
    private int port;  
        
    
    /**  
     * 构造基于密码认证的sftp对象  
     * @param userName  
     * @param password  
     * @param host  
     * @param port  
     */    
    public SftpUtil(String username, String password, String host, int port) {  
        this.username = username;  
        this.password = password;  
        this.host = host;  
        this.port = port;  
    }  
    
    /**  
     * 构造基于秘钥认证的sftp对象 
     * @param userName 
     * @param host 
     * @param port 
     * @param privateKey 
     */  
    public SftpUtil(String username, String host, int port, String privateKey) {  
        this.username = username;  
        this.host = host;  
        this.port = port;  
        this.privateKey = privateKey;  
    }  
    
    public SftpUtil(){}  
    
    /** 
     * 连接sftp服务器 
     * 
     * @throws Exception  
     */  
    public void login(){  
        try {  
            JSch jsch = new JSch();  
            if (privateKey != null) {  
                jsch.addIdentity(privateKey);// 设置私钥  
                log.info("sftp connect,path of private key file：{}" , privateKey);  
            }  
            log.info("sftp connect by host:{} username:{}",host,username);  
    
            session = jsch.getSession(username, host, port);  
            log.info("Session is build");  
            if (password != null) {  
                session.setPassword(password);    
            }  
            Properties config = new Properties();  
            config.put("StrictHostKeyChecking", "no");  
                
            session.setConfig(config);  
            session.connect();  
            log.info("Session is connected");  
              
            Channel channel = session.openChannel("sftp");  
            channel.connect();  
            log.info("channel is connected");  
    
            sftp = (ChannelSftp) channel;  
            log.info(String.format("sftp server host:[%s] port:[%s] is connect successfull", host, port));  
        } catch (JSchException e) {  
            log.error("Cannot connect to specified sftp server : {}:{} \n Exception message is: {}", new Object[]{host, port, e.getMessage()});    
        }  
    }    
    
    /** 
     * 关闭连接 server  
     */  
    public void logout(){  
        if (sftp != null) {  
            if (sftp.isConnected()) {  
                sftp.disconnect();  
                log.info("sftp is closed already");  
            }  
        }  
        if (session != null) {  
            if (session.isConnected()) {  
                session.disconnect();  
                log.info("sshSession is closed already");  
            }  
        }  
    }  
    
    /**  
     * 将输入流的数据上传到sftp作为文件  
     *   
     * @param directory  
     *            上传到该目录  
     * @param sftpFileName  
     *            sftp端文件名  
     * @param in  
     *            输入流  
     * @throws SftpException   
     * @throws Exception  
     */    
    public void upload(String directory, String sftpFileName, InputStream input) throws SftpException{  
        try {    
            sftp.cd(directory);  
        } catch (SftpException e) {  
            log.warn("directory is not exist");  
            sftp.mkdir(directory);  
            sftp.cd(directory);  
        }  
        sftp.put(input, sftpFileName);  
        log.info("file:{} is upload successful" , sftpFileName);  
    }  
    
    /**  
     * 上传单个文件 
     * 
     * @param directory  
     *            上传到sftp目录  
     * @param uploadFile 
     *            要上传的文件,包括路径  
     * @throws FileNotFoundException 
     * @throws SftpException 
     * @throws Exception 
     */  
    public void upload(String directory, String uploadFile) throws FileNotFoundException, SftpException{  
        File file = new File(uploadFile);  
        upload(directory, file.getName(), new FileInputStream(file));  
    }  
    
    /** 
     * 将byte[]上传到sftp，作为文件。注意:从String生成byte[]是，要指定字符集。 
     *  
     * @param directory 
     *            上传到sftp目录 
     * @param sftpFileName 
     *            文件在sftp端的命名 
     * @param byteArr 
     *            要上传的字节数组 
     * @throws SftpException 
     * @throws Exception 
     */  
    public void upload(String directory, String sftpFileName, byte[] byteArr) throws SftpException{  
        upload(directory, sftpFileName, new ByteArrayInputStream(byteArr));  
    }  
    
    /**  
     * 将字符串按照指定的字符编码上传到sftp 
     *   
     * @param directory 
     *            上传到sftp目录 
     * @param sftpFileName 
     *            文件在sftp端的命名 
     * @param dataStr 
     *            待上传的数据 
     * @param charsetName 
     *            sftp上的文件，按该字符编码保存 
     * @throws UnsupportedEncodingException 
     * @throws SftpException 
     * @throws Exception 
     */  
    public void upload(String directory, String sftpFileName, String dataStr, String charsetName) throws UnsupportedEncodingException, SftpException{    
        upload(directory, sftpFileName, new ByteArrayInputStream(dataStr.getBytes(charsetName)));    
    }  
    
    /** 
     * 下载文件  
     * 
     * @param directory 
     *            下载目录  
     * @param downloadFile 
     *            下载的文件 
     * @param saveFile 
     *            存在本地的路径 
     * @throws SftpException 
     * @throws FileNotFoundException 
     * @throws Exception 
     */    
    public void download(String directory, String downloadFile, String saveFile) throws SftpException, FileNotFoundException{  
        if (directory != null && !"".equals(directory)) {  
            sftp.cd(directory);  
        }  
        File file = new File(saveFile);  
        sftp.get(downloadFile, new FileOutputStream(file));  
        log.info("file:{} is download successful" , downloadFile);  
    }  
    /**  
     * 下载文件 
     * @param directory 下载目录 
     * @param downloadFile 下载的文件名 
     * @return 字节数组 
     * @throws SftpException 
     * @throws IOException 
     * @throws Exception 
     */  
    public byte[] download(String directory, String downloadFile) throws SftpException, IOException{  
        if (directory != null && !"".equals(directory)) {  
            sftp.cd(directory);  
        }  
        InputStream is = sftp.get(downloadFile);  
          
        byte[] fileData = IOUtils.toByteArray(is);  
          
        log.info("file:{} is download successful" , downloadFile);  
        return fileData;  
    }  
    
    /** 
     * 删除文件 
     *   
     * @param directory 
     *            要删除文件所在目录 
     * @param deleteFile 
     *            要删除的文件 
     * @throws SftpException 
     * @throws Exception 
     */  
    public void delete(String directory, String deleteFile) throws SftpException{  
        sftp.cd(directory);  
        sftp.rm(deleteFile);  
    }  
    
    /** 
     * 列出目录下的文件 
     *  
     * @param directory 
     *            要列出的目录 
     * @param sftp 
     * @return 
     * @throws SftpException 
     */  
    public Vector<?> listFiles(String directory) throws SftpException {  
        return sftp.ls(directory);  
    }  
      
    public static void main(String[] args) throws SftpException, IOException {  
        SftpUtil sftp = new SftpUtil("lxt", "200323", "192.168.2.106", 22);
        //登录
        sftp.login();
        //源文件转换成输入流
        File file = new File("/home/lxt/my-file/images");
        InputStream is = new FileInputStream(file);  
        
        //输出到服务器特定目录
        sftp.upload("/home/lxt/my-file/images", "contact.sql", is);
        //退出
        sftp.logout();  
    }  
}
